User blog comment:Pikazen MC/Permanent Pokemon Stall/@comment-32452525-20180218210208/@comment-32358261-20180219045142

In core games the main difference is that mythicals are event exclusive (except deoxys in Oras) and legendaries are caught without events.

This won’t always apply in PBB since some mythicals like jirachi and victini can be obtained normally in a specific location. So they are worth the same as any legendary caught this way roughly (unless competitive viability is considered too)

Marshadow and manaphy are worth more since they were limited time only